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Activity for Residential First-Lien Mortgage Servicing Rights (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Servicing Assets at Fair Value [Line Items]        
Balance at beginning of period     $ 64,824  
Additions     30,962 41,128
Balance at End of Period 135,152   135,152  
Mortgage Servicing Rights
        
Servicing Assets at Fair Value [Line Items]        
Balance at beginning of period 71,225 43,098 64,824 5,315
Additions 61,606 16,676 76,272 45,291
Changes in assumptions 4,323 [1] 1,444 [1] (318) [1] 11,764 [1]
Other changes (2,002) [2] (984) [2] (5,626) [2] (2,136) [2]
Balance at End of Period $ 135,152 $ 60,234 $ 135,152 $ 60,234
[1] Primarily reflects changes in prepayment assumptions due to changes in market interest rates.
[2] Represents changes due to realization of expected cash flows.